Most common phobias

I read before that the #1 and #2 most common fears were public speaking and death, in that order. Are those considered rational fears and thus not phobias? Why wouldn't they be on here? I suppose fear of public speaking would be covered under "social phobias"... though how are you supposed to know that it is included under a big blanket title like that, and wouldn't social phobias be far and away #1? I imagine something like 3/4 or 9/10 people have some social phobia of some kind. Depends on how exactly you define phobia. Significantly fewer have an irrational fear of spiders. And what about claustrophobia? Could that possibly be less common than agoraphobia (which I got typing in "enclosed spaces"- even though it's the opposite)?